Editorial Technical Reference

Backplane

This page explains how Backplane is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A printed circuit board that provides electrical and mechanical connections for multiple modules in a Programmable Logic Controller (PLC) rack.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Backplane

Definition
The backplane is a critical component within a Programmable Logic Controller (PLC) rack, serving as the central communication and power distribution backbone. It provides standardized slots and connectors that allow various PLC modules (such as CPU, I/O, communication, and power supply modules) to be installed, interconnected, and powered. It facilitates high-speed data exchange between modules and ensures reliable system operation in industrial automation environments. The backplane is typically made of FR-4 glass epoxy with copper traces and gold or tin plated connectors. It is available in configurations with 4 to 12 slots, widths from 100 to 300 mm, and heights from 80 to 200 mm, compatible with standard 19-inch racks. Electrical specifications include rated current per pin from 1 to 10 A, rated voltage from 24 to 250 V AC/DC, contact resistance of ≤20 mΩ, insulation resistance of ≥100 MΩ at 500 V DC, and dielectric withstand voltage of 1500 to 3000 V AC for 1 minute without breakdown. The backplane operates over a temperature range of -40 to 85 °C, with storage from -40 to 105 °C, and relative humidity of 5 to 95% non-condensing. It offers IP ratings from IP20 to IP65, depending on the enclosure. The base material is FR-4 with UL 94V-0 flammability rating, and copper thickness ranges from 35 to 70 μm. These parameters are reference ranges; actual values must be verified with the manufacturer for the specific model and application. The backplane is designed to meet IEC 60664 for insulation coordination, IEC 60512 for contact resistance, IEC 60243 for dielectric strength, IEC 60068 for environmental testing, and IPC-4101 and IPC-6012 for material and performance. Always confirm compliance with the relevant standards for your specific installation.
Working Principle
The backplane operates by providing a set of parallel electrical pathways (buses) embedded within a printed circuit board. When a module is inserted into a slot on the rack, its edge connector mates with the corresponding connector on the backplane. This establishes connections for power, ground, data, address, and control signals. The backplane's bus architecture allows all connected modules to communicate with the central processing unit (CPU) and with each other according to the PLC's communication protocol (e.g., proprietary backplane bus, PCI, etc.).
Common Materials
FR-4 (Flame Retardant 4) Glass Epoxy, Copper (for traces), Gold or Tin plating (on connectors)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Number of Slots4–12Determines module capacity
Backplane Width100–300 mmFits rack dimensions
Backplane Height80–200 mmStandard 19-inch rack compatible
Rated Current per Pin1–10 AHigher current requires larger pinIEC 60664
Rated Voltage24–250 V AC/DCInsulation coordination per standardIEC 60664
Contact Resistance≤20 Lower is better for signal integrityIEC 60512
Insulation Resistance≥100 At 500 V DCIEC 60243
Dielectric Withstand Voltage1500–3000 V ACFor 1 minute, no breakdownIEC 60243
Operating Temperature-40–85 °CExtended range for industrialIEC 60068
Storage Temperature-40–105 °CNon-operatingIEC 60068
Relative Humidity5–95 % RHNon-condensingIEC 60068
IP RatingIP20–IP65Higher for harsh environmentsIEC 60529
Base MaterialFR-4Glass epoxy, UL 94V-0IPC-4101
Copper Thickness35–70 μmHeavier copper for high currentIPC-6012

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • PCB (Printed Circuit Board) Part
    The substrate that holds and electrically connects all other components via etched copper traces.
    Material: FR-4 Glass Epoxy
  • Edge Connectors / Slots Part
    Provide the physical and electrical interface for PLC modules to connect to the backplane bus.
    Material: Plastic housing with metal (gold/tin plated) contacts
  • Bus Traces Part
    Copper pathways on the PCB that carry power, data, address, and control signals between connectors.
    Material: Copper
  • Termination Resistors Part
    Prevent signal reflections on high-speed bus lines to ensure signal integrity.
    Material: Ceramic, Metal Film

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (non-pressurized electrical component)
other spec: Humidity: 5% to 95% non-condensing, Vibration: 5-500 Hz at 2G, Shock: 50G for 11ms
temperature: -40°C to +85°C
Media Compatibility
✓ Industrial control cabinets ✓ Clean manufacturing environments ✓ Temperature-controlled enclosures
Unsuitable: Corrosive chemical exposure or high particulate contamination
Sizing Data Required
  • Number of required module slots
  • Backplane bus architecture (e.g., PCIe, VME, custom)
  • Required power delivery capacity (watts per slot)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Connector pin degradation
Cause: Cyclic thermal expansion/contraction causing fretting corrosion and loss of electrical contact integrity
PCB delamination
Cause: Moisture ingress combined with thermal cycling leading to separation of laminate layers and trace damage
Maintenance Indicators
  • Intermittent system errors or data corruption during vibration or thermal changes
  • Visible discoloration, warping, or charring around connector interfaces
Engineering Tips
  • Implement controlled environment storage with humidity below 40% RH and temperature stabilization before installation
  • Apply periodic contact resistance testing and thermal imaging during preventive maintenance cycles

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 61188-5-1 (Printed boards and assemblies - Design and use) IPC-6012 (Qualification and Performance Specification for Rigid Printed Boards)

Quoted from the published standard.

Manufacturing Precision
  • Board Thickness: +/-10% of nominal
  • Hole Positional Tolerance: +/-0.1mm
Quality Inspection
  • Automated Optical Inspection (AOI) for solder joints and component placement
  • In-Circuit Test (ICT) for electrical continuity and functionality

Manufacturers of Backplane

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Frequently Asked Questions

What is the function of a PLC backplane?

A PLC backplane provides the mechanical and electrical interface for mounting and interconnecting PLC modules such as CPU, I/O, and power supplies. It distributes power and enables communication between modules.

What materials are used in a typical backplane?

Common materials include FR-4 glass epoxy as the base, copper for conductive traces, and gold or tin plating on connectors to ensure reliable contact.

What are the typical electrical ratings for a backplane?

Typical ratings include rated current per pin from 1 to 10 A, rated voltage from 24 to 250 V AC/DC, contact resistance ≤20 mΩ, and insulation resistance ≥100 MΩ at 500 V DC. Always verify with the manufacturer.

Which standards apply to PLC backplanes?

Relevant standards include IEC 60664 for insulation coordination, IEC 60512 for contact resistance, IEC 60243 for dielectric withstand, IEC 60068 for environmental conditions, and IPC-4101/6012 for materials. Compliance must be confirmed for the specific product.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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